1 Cor 9:25: And every man that strives for the mastery is temperate in all things. Now they do it to obtain a corruptible crown; but we an incorruptible.
Incorruptible crown is a crown for people who brought their body unto subjection; disciplined their body; – had self-control.
1 Cor 9:24 – 25: Know ye not that they which run in a race run all, but one receives the prize? So run, that ye may obtain. And every man that strives for the mastery is temperate in all things. Now they do it to obtain a corruptible crown; but we an incorruptible.
1 Cor 9:26 – 27: I therefore so run, not as uncertainly; so fight I, not as one that beats the air. But I keep under my body, and bring it into subjection: lest that by any means, when I have preached to others, I myself should be a castaway.
Paul uses the word ‘temperate’ meaning self – control and he explains that it is through keeping the body into subjection that you receive an incorruptible crown.